怎样引用类中非静态的方法

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
    class Program
    {
        //非静态方法
        public SqlConnection createSqlConnection()
        {
            //数据库连接字符串
            string sql = "Data Source = localhost;DataBase=db_MyDemo;User Id=sa;Password=123456";
            SqlConnection con = new SqlConnection(sql);
            con.Open();
            return con;
        }

        //静态方法
        public static int InsertAll()
        {
            //拼接sql语句
            StringBuilder strSQL = new StringBuilder();
            strSQL.Append("insert into tb_SelCustomer ");
            strSQL.Append("values(");
            strSQL.Append("'liuhao','0','0','13822223333','liuhaorain@163.com','广东省深圳市宝安区',12.234556,34.222234,'422900','备注信息')");
            Console.WriteLine("Output SQL:
{0}", strSQL.ToString());
            //创建Command对象
            SqlCommand cmd = new SqlCommand();

            //静态方法调用非静态方法
            cmd.Connection =new Program().createSqlConnection();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = strSQL.ToString();
            int rows = cmd.ExecuteNonQuery();
            return rows;
        }

        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine("受影响的行数为: {0}", InsertAll());
            }
            catch (Exception ex)
            {
                Console.WriteLine("
Error：
{0}", ex.Message);
            }
            Console.Read();
        }

    }
}